单轴压缩砂岩细观裂纹动态演化特征试验研究  

Experimental investigation on dynamic evolution characteristics of micro-cracks for sandstone samples under uniaxial compression

作　　者：王春来[1] 侯晓琳 李海涛 张书江 陶志刚[4] WANG Chun-lai;HOU Xiao-lin;LI Hai-tao;ZHANG Shu-jiang;TAO Zhi-gang(School of Energy and Mining Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;Safety Technology Branch,CCTEG China Coal Research Institute,Beijing 100013,China;Shanxi Jizhong Energy Group Mining Industry Co.,Ltd.,Taiyuan 030032,China;State Key Laboratory for Geomechanics&Deep Underground Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)能源与矿业学院,北京100083 [2]煤炭科学技术研究院有限公司安全分院,北京100013 [3]山西冀中能源集团矿业有限责任公司,山西太原030032 [4]中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室,北京100083

出　　处：《岩土工程学报》2019年第11期2120-2125,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家重点研发计划项目(2017YFC0804201);国家自然科学基金项目(51574246);孙越崎杰出学者项目(800015Z1138);中央高校基本科研业务费专项资金项目(2011QZ01)

摘　　要：岩石细观裂纹的动态演化特征作为岩石破坏的重要信息,其研究对于分析岩爆的孕育过程及预测岩石动力灾害发生有着重要意义。采用应力分析和声发射参数方法,研究了砂岩在单轴压缩条件下的细观裂纹的强度动态演化特征。试验结果表明,应力与砂岩细观裂纹扩展诱发声发射(AE)事件的强度特征有较好的阶段性变化规律,将峰前裂纹动态演化划分为三个阶段。进一步分析裂纹的类型特征,提出三阶段四维演化过程分析方法。细观裂纹多为张拉型,随着时间的增加,细观裂纹向剪切型裂纹转变,裂纹数量迅速增加,裂纹强度逐渐增大。提出将第三阶段AE事件出现的高强度、高RA、低AF特征作为砂岩破裂失稳的定性预警条件。通过矩张量反演对比分析了的细观裂纹数量和类型的动态演化。The dynamic evolution characteristics of micro-cracks are the important information of rock failure for their significance in analyzing the failure process of rockburst and predicting the rock dynamic hazard. The uniaxial compression tests are conducted on sandstones, while their stress and the intensity characteristics of acoustic emission(AE) are analyzed to study the dynamic evolution process of crack. The results show that the stress variation and the intensity characteristics of AE events have a consistent segmented transformation pattern, which is used to divide the evolution process into three phases. A four-dimensional evolution method is proposed based on the further analysis of the characteristics of crack type. The micro-cracks are mostly tensile. With the increase of time, the micro-cracks change to shear-type cracks, the number of the cracks increases rapidly, and their intensity increases gradually. It is proposed that the AE events occurring with high intensity, high RA and low AF characteristics in the third phase are used as the qualitative prediction of rock failure. By comparing the inversion results of the moment tensors, the dynamic evolution characteristics of the micro-cracks are obtained.

关 键 词：裂纹演化 细观裂纹 声发射 矩张量 预警 

分 类 号：TU45[建筑科学—岩土工程]